Disc brake



FIG. 1 is a front perspective view of a disk brake, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Any broken lines in the figures illustrate portions of the disc brake that forms no part of the claimed design. 

CLAIM The ornamental design for a disk brake, as shown and described. 